Hi. what should be eaten after 1 day bout of diarrhea (6x bowel movement in one day)? when can i go back to eating ice cream? is probiotics ok?

Three questions..: Self-limited viral gastroenteritis, or recurring problem? Circumstances under which diarrhea developed (malabsorption, pancreatic maldigestion, food intolerances, stressful times, exposure to ill individuals, food poisoning, ischemic gut, inflammatory colitis, etc.), severity (stool volume, dehydration, blood, night-time awakening, weight loss), duration? Probiotics good, as is dietary caution.